Gear and wheel puller



w.' WOOLDRIDGE GEAR AND WHEEL FULLER Fi led Sept. 29. 1927 Patented Aug. 20, 1929.

UNITED STATES WILLIAM I. WOOLDRIDGE, OF NEW YORK, N. Y.

GEAR AND WHEEL FULLER.

Application filed September 29, 1927. Serial No. 222,759.

This invention relates to a gear and wheel puller to facilitate the removal of the gear or wheel from a shaft, and has for an ob ect to provide an improved device of this character which will give a larger range of operation, that is, may be used on gears or wheels of greater variation in diameters without having a too great inclination of the hooks for jaws on the wheel or gear which would tend to cause them to spread and slide off the element when strain is placed on them for the pulling operation.

It is also an object of the invention to provide a device of this character which will require less clearance space for insertion of the jaws back of the gear or wheel belng drawn.

\Vith the foregoing and other objects in view, I have devised the construction illustrated in the accompanying drawing as embodying the preferred forms of my inven tion. In this drawing,

Fig. 1 is a side elevation of the device as used on gears or wheels of larger diameters,

the gear being shown in sect-ion.

Fig. 2 is a similar side elevation showing the device as used on gears and wheels of a smaller diameter.

Fig. 3 is a top plan View of the'device showing the use of three levers or jaws in place of the two levers and jaws of Figs. 1 and 2.

Fig. at is a transverse section just above the gear showing a slightly different shape of jaw and the use of an auxiliary jaw holding means.

Fig. 5 is a side elevation of the jaw shown in Fig. 4 with the gear being operated upon shown in section.

Figs. 6 and 7 are side and edge elevations respectively of a slightly different construction of Fig. 8 is a top plan view of a wrench for operating the cam nut, and

Fig. 9 is a side elevation. thereof.

In the construction illustrated 1O reprevsents a shaft on which is mounted a gear or wheel 11 or 12 to be removed from the shaft, and as illustrated the gear 11 is of a larger diameter than gear 12. My device comprises a frame 13 having a central portion with a threaded opening therethrough for threaded engagement with a screw 14. This screw carries a head 15 to engage the end of the shaft 10 and it is preferred that this head be mounted on a rod 16 extending longitudinally through the screw and having limited longitudinal movement therein with a head 17 at the opposite end of the screw to be hit by a hammer for starting the gear from the shaft. The screw also has a square or other non-circular head 18 for the use of a wrench for operating the screw. The frame 13 has radially extending arms 19 which are preferably double to receive between them the levers 20 carrying the jaws 21 for engaging the gear or wheel. These levers are of a thickness to be mounted between the members of the arms and are pivoted to the arms by transversely extending bolts 32. It will be noted that each arm has two or more transversely extending openings 23 for this pivot bolt which are spaced different distances from the center of the frame and screw 14, whereby the levers may be pivoted in the frame at different distances from this center. The levers also have curved cam surfaces 24 on their inner edge walls to cooperate with a cam or nut 25 threaded on the screw. This nut has surfaces 26 and 27 of different diameters at its two opposite sides respectively and the nut is reversible on the screw so that when it is in the position of Fig. 1 with the larger diameter 26 down this larger surface will engage and cooperate with the cam surfaces 24 on the levers when the levers are pivoted in the outer openings 23 which are the greatest distance from the center of the frame, but when the nut is reversed as shown in Fig. 2, the operating surface 27 of smaller diameter is at the lower side of the nut and engages and cooperates with the cam surfaces 24on the levers when the levers are pivoted in the inner openings 23 or these openings which are nearer to the center of the frame. The nut may have a pair of openings 28 therethrough to receive the projecting ends 29 on a substantially U-shaped wrench 30 for easy manipulation of the nut. The levers 20 have at their lower free ends heads or jaws 31 forming shoulders to engage the outer peripheries of the gear or wheel. With the form of jaws shown in Figs 1, 2 and 3, these jaws have shoulders both on the inner and outer sides of the levers so that they may engage the outer periphery of either wheel or gear or may engage the inner side of the rim of the wheel or gear.

In operation, as shown in Fig. 1, the device is arranged for use for pulling a gear of larger diameter from the shaft, and for this purpose the levers are pivoted in the outer openings 23 in the arms of the frame which locate these levers a greater distance apart. The cam nut 25 is used as shown with its larger diameter 26 downwardly to engage the cam surfaces 24: on the levers. It

will be obvious that manipulation of this nut by rotation on the screw to move it downwardly'will cause the surface 26 on the nutto cooperate with the cam surfaces 24 on the lever to clamp the jaws at the lower ends of these levers on opposite sides of the gear or wheel 11. Then by manipulation of the screw let the gear may be withdrawn from the shaft. In the construction shown the wheel may be first slightly loosened by hitting a blow ofa hammer on the head 17 of the central rod, after which the gear may be removed by manipulating the screw. In Fig. 2 the device is shown as used for withdrawing a gear 12 of smaller diameter from the shaft. It will be apparent that with this gear the levers are pivoted in the inner openings 23 which are nearer to the center of the frame, but that the cam nut 25 is reversed with the smaller diameter 27 downwardly to engage the cam surfaces 24L on the levers and that manipulation of this nut will cause these surfaces to force the jaws of the lever inwardly and clamp them on the op posite sides of the gear, after. which the gear may be loosened and then removed the same as described in connection with Fig. 1. It will be apparent that this construction permits the use of the levers in'substantially parallel relation and substantially parallel to the axis of the screw of the shaftfor a wider range of gear orwheel diameters than would be possible if the levers were always pivoted at the same. distance from the center of the frame and screw, and therefore, for both large and small diameters of gears within the range of the device I secure a more reliable grip on the gear with less inclination of the jaws with respect to the surfaces of the gears. In other words the jaws engage the surfaces of the gears and pull thereon at substantially right angles so that there is 'less tendency for the jaws to slide off under strain than there would be where the jaws are at an inclination to the surfaces of the gear. Also as the jaws are substantially parallel to the axis of the shaft they can be used on either large or small gears with less clearance space about the gear for insertion of the aws than would be required where the aws must be used at a considerable of an inclination. ,Thus this tool may be used in locations where tools without the adjustable pivot feature for the jaw levers would not be operative.

In Fig. 8 is shown a device of this character which is practically the same as that shown in Figs. 1 and 2, except that whereas in Figs. 1 and 2 two jaws only are used, the frame 32 has three arms 33 so that three jaws carrying levers 20 are used.

In Figs. 4c and 5 I have shown jaws 34 of slightly different shape from those of Figs. 1 and 2. These jaws, however, are formed on .the same type of levers and are used in the same frame 13 or 32 and with the same cam nut- 25 as the jaws of the first form. If desired a frame 35 may be provided to extend on opposite sides of the we and having a thumb screw 36 threaded through one end. lVith one end of this frame engaging outside one of the levers and the end of the thumb screw engaging the outside of the other lever this frame may be used to assist the cam nut 25 in clamping the jaws against the opposite sides of the gear or wheel to be pulled and to reduce the liability of the jaws slipping from the wheel or gear underthe strain of the pulling operation. This frame is not limited to use with the type of jaws in Figs. 4 and 5, but may also be used with the type of jaws shown in Figs. 1 and 2.

In Figs. 6 and 7 I have shown jaws of still a different shape. In this form the levers 37 are shown somewhat shorter than those of Figs. 1 and 2, but have the same cam surfaces 2& for cooperation with the cam surfaces 26 and 27 on the nut 25, and these levers are pivoted inthe frame 13 or 32 the same as the other lovers. The jaws 38, however, are ineffect forked with a notchfior recess 39 so that they may engage under the head of a bolt or the like.

Having thus set forth the nature of my invention, what I claim is:

1. In a gear or wheel puller, a frame, a plurality of levers pivoted to the frame and having shoulders at one end-to engage the element to be pulled, said frame beingprovided with means whereby each of the levers may be pivoted at different distances from the center, a central screw threaded in the frame to engage the end of the shaft on which the element is mounted, said levers being provided with-cam surfaces, and operating cams of different'diameters threaded on the screw and arranged to respectively coact with said cam surfaces to operate the levers when they are in the difi'erentlocations. i

2. In a gear or wheel puller, a frame having laterally extending arms, each of said arms having a plurality of-transverse openings spaced different distances from its center to receive. a pivot pin for a lever, a plurality of lovers pivoted in said arms and having jaws at oneend to engage the element to be pulled, said levers each having a cam surface on itsinner edge, a'screw threaded through the center of the frame, and a reversible nut threaded on the screw and having surfaces of different diameters to cooperate with said cam surfaces when the levers are in the different positions.

In a gear or wheel puller, a frame having laterally extending arms, a screw threaded in said frame to engage the shaft on which the gear or wheel is mounted, a plurality of levers having jaws to engage the gear or wheel, means for pivoting the levers at different radial distances from the center of the frame, said levers having cam surfaces, and a nut threaded on the screw and having surfaces of different diameters to cooperate with the cam surfaces on the levers to clamp the jaws against the gear or wheel when the levers are mounted in the different positions respectively on the frame.

4. In a gear or wheel puller, a frame having laterally extending arms, a screw threaded in said frame to engage the shaft on which the gear or wheel is mounted, a plurality of levers having jaws to engage the gear or wheel, means for pivoting the levers at different radial distances from the center of the frame, said levers having cam surfaces on their inner edges, a cam nut threaded on the screw and having adjacent its opposite ends circular surfaces of different diameters to engage and cooperate with the cam surfaces on the levers, said nut being reversible on the screw so that these surfaces of different diameters can respectively engage the cam surfaces when the levers are mounted at the different distances from the center of the frame.

In testimony whereof I affix my signature.

WILLIAM I. l/VOOLDRIDGE. 

